Traffic Accidents

Drug Driving Defense Lawyer

Drug Driving Defense Lawyer | Understanding the criminal charge, license revocation, and the awareness dispute

Summary

Drug driving refers to operating a vehicle while under the influence of a narcotic, psychotropic substance, or substance with intoxicating effects, and it is punished separately from drunk driving under the Road Traffic Act (도로교통법 제45조, 제148조의2). Because there is no numeric threshold like the blood alcohol limit, prosecutors and police rely heavily on urine or hair testing and the driver's behavior at the scene. A criminal investigation and a license revocation proceeding run on separate tracks with separate standards of proof, and in many cases the central dispute is whether the driver knowingly and voluntarily took the substance before driving.

Traffic · Criminal Related law: Road Traffic Act Related law: Act on the Control of Narcotics

Drug Driving Defense | Criminal Case vs. License Revocation: Different Standards, Different Timelines

A drug driving incident triggers a criminal prosecution and a separate administrative action against your driver's license. They are decided independently, sometimes with different outcomes, so it helps to understand how each one works before deciding how to respond.

Criminal Case

Handled by the police, prosecutor's office, and criminal court

Standard of proof	Guilt beyond reasonable doubt
Key issue	Whether you knowingly drove after taking the substance
Possible outcome	Fine, suspended sentence, or imprisonment
Governing law	Road Traffic Act Art. 148-2, 45

Driving while under the influence of drugs is punishable by imprisonment or a fine under the Road Traffic Act (도로교통법 제148조의2 제3항, 제45조). Unlike drunk driving, there is no statutory concentration threshold, so the charge depends on proof of actual impairment or presence of the substance combined with driving conduct.

License Revocation

Handled by the district police agency and, if disputed, administrative court

Standard of proof	Lower than criminal 'beyond doubt' standard
Key issue	Whether a positive test result is reliable and attributable to you
Possible outcome	License revocation, points, or no action
Governing law	Road Traffic Act Art. 93

A positive drug test while driving is a mandatory ground for license revocation under the Road Traffic Act (도로교통법 제93조 제1항 제1호의2). This can proceed and become final even before the criminal case is decided, so a separate objection or administrative appeal deadline applies.

Drug Driving Defense | Why the Criminal Case and the License Case Can End Differently

Many clients assume that if the criminal case ends favorably, the license issue disappears too, or vice versa. In practice, the two proceedings use different evidence rules and different burdens of proof.

Criminal liability requires proof of a voluntary, aware act

To convict, prosecutors generally must show that you knowingly ingested a controlled substance and then chose to drive while its effects could reasonably be expected to impair you (도로교통법 제45조, 제148조의2). A lab result alone establishes presence in the body, not necessarily criminal intent or the timing of ingestion relative to driving.

License revocation follows a stricter, near-automatic rule

Once a positive result is confirmed through an official testing procedure, revocation is largely mandatory regardless of intent (도로교통법 제93조 제1항 제1호의2). Challenging this requires attacking the reliability of the test itself or the chain of custody, not arguing lack of awareness.

Timelines run independently

The criminal case can take months to reach trial, while the license notice often arrives within weeks of the test. Missing the administrative objection window while focused only on the criminal defense is a common and costly mistake.

Drug Driving Defense | Did You Know You Had Taken the Substance?

In many drug driving cases the driver does not dispute the test result itself, but disputes whether they knowingly and voluntarily consumed the substance close enough in time to have understood the risk of driving.

Unwitting ingestion claims

Some cases involve a driver who took what they believed was an ordinary prescription or over-the-counter medication that, unknown to them, contained a controlled substance, or who was given a substance without their knowledge. Establishing this requires documentary evidence such as prescriptions, pharmacy records, or the packaging itself.

Timing between ingestion and driving

Detection windows for many substances in urine or hair extend well beyond the period of actual impairment. Arguing that the substance was taken days earlier, with no impairing effect remaining at the time of driving, can be relevant to the criminal charge even though it does not affect the license revocation outcome.

Distinguishing legitimate medical use

Certain prescribed psychotropic medications can trigger a positive result. Whether taking a properly prescribed medication under a doctor's instructions, without any sign of impaired driving, still amounts to a violation is a fact-specific issue that depends on dosage, timing, and observed driving conduct.

Drug Driving Defense | How Drug Driving Is Detected and Challenged

Because there is no breathalyzer-style instant test comparable to alcohol screening, drug driving cases rely on roadside observation, field sobriety indicators, and laboratory confirmation, each of which can be contested.

Roadside screening and field observation

Officers typically note driving pattern, physical signs, and responses during a roadside stop before requesting a urine or saliva screening test. These initial observations often become key evidence for the criminal case's impairment argument.

Confirmatory lab testing

A positive screening result is generally followed by confirmatory testing, often through the National Forensic Service, using urine or hair samples. Challenging the chain of custody, sample handling, or testing methodology is one of the few technical avenues to dispute the result itself.

Refusal to be tested

Refusing a lawful request for testing can itself carry separate legal consequences and is generally treated unfavorably in both the criminal and administrative proceedings. Whether a particular request was lawfully made is sometimes a separate point of dispute.

Drug Driving Defense | How a Drug Driving Case Typically Proceeds

Initial consultation and case review
We review the police report, test results, and the circumstances of the stop to identify whether awareness, testing reliability, or procedural issues are viable defense angles.

Police investigation and possible additional testing
You may be summoned for further questioning, and the substance and quantity detected are confirmed through the forensic report before referral to the prosecutor's office.

Prosecutorial decision and, if disputed, administrative objection to license revocation
The prosecutor decides whether to indict, seek a summary fine, or dismiss, while separately you may need to file an objection with the police agency or an administrative appeal regarding license revocation within its own deadline.

Trial or summary proceeding
If indicted, the case proceeds to criminal trial where the awareness issue, test reliability, and sentencing factors are argued; many cases are resolved through summary order without a full trial.

Sentencing and license outcome
The criminal court issues its judgment, and the license revocation (with its own restriction period before reapplication) is finalized separately based on the administrative record.

Drug Driving Defense | How Legal Fees Are Structured in Drug Driving Cases

Retainer fee
Generally based on the stage of the case (police investigation only, versus prosecutor referral, versus trial) and the complexity of the awareness dispute, rather than a fixed flat rate.

Success-linked fee
If applicable, this is tied to a clearly defined outcome such as a reduced charge, non-indictment, or a more favorable sentence, and must be agreed in writing in advance rather than promised informally.

Administrative appeal fee
Handling the separate objection or administrative appeal against license revocation is typically billed apart from the criminal defense, reflecting the additional filings and hearing preparation involved.

Expert and documentary costs
Where forensic re-analysis, medical record review, or expert opinion on detection windows is needed, these costs are itemized separately from the attorney's fee.

Incidental costs
Court filing fees, transcript requests, and travel for hearings outside Seoul are billed as actual expenses incurred.

※ Costs vary depending on case complexity and specific circumstances; exact fees will be provided during consultation. No specific outcome is guaranteed.

Drug Driving Defense | Self-Check Before Your Consultation

1️⃣ Understand What You Are Actually Facing

Have you received notice of both a criminal investigation and a license revocation notice?
Do you know which specific substance the test reported and its reported concentration?
Has a confirmatory lab test been completed, or only a roadside screening?
Do you know the deadline for objecting to the license revocation notice?

2️⃣ Assess the Awareness Issue

Can you identify exactly when and how the substance entered your body?
Do you have a valid prescription or medical record for any substance detected?
Is there any possibility the substance was given to you without your knowledge?
How much time passed between your last known ingestion and the time you were driving?

3️⃣ Review the Testing and Arrest Process

Were you informed of your right to refuse or request a different testing method?
Was the sample collection, storage, and transport documented properly, as far as you know?
Did the officer note any specific signs of impaired driving, or only the general stop reason?
Do you have a copy of the police report or testing request form?

Frequently Asked Questions

Q. Is drug driving punished the same way as drunk driving in Korea?

A. No. Drunk driving has a statutory blood alcohol concentration threshold, while drug driving under the Road Traffic Act (도로교통법 제148조의2 제3항, 제45조) has no numeric threshold and instead depends on proof that a controlled or intoxicating substance affected your ability to drive safely. This makes the evidentiary picture, and the available defenses, quite different.

Q. If I test positive but didn't feel impaired, can I still be charged?

A. Yes, presence of the substance combined with the act of driving can support a charge even without a witness describing visibly impaired driving, though the strength of the case depends on the specific facts (도로교통법 제45조). Whether you knowingly took the substance close enough in time to driving is often the more contested issue than whether you 'felt' impaired.

Q. Will my license be revoked even if the criminal case is dismissed?

A. It is possible, because license revocation under the Road Traffic Act (도로교통법 제93조 제1항 제1호의2) follows its own administrative standard and timeline, separate from the criminal outcome. If you plan to contest the revocation, you generally need to file an objection or administrative appeal within its own deadline rather than waiting for the criminal case to conclude.

Q. Can I argue that I took a prescribed medication and didn't know it would show up as a violation?

A. This can be a relevant argument for the criminal case if you have documentation such as a prescription, pharmacy record, or medical note showing the medication was legitimately prescribed and taken as directed. Whether it changes the outcome depends on the specific substance, dosage, and whether there was any observable impairment while driving.

Q. How long does a substance stay detectable after use?

A. Detection windows vary widely by substance and testing method; hair testing in particular can detect substances used weeks or months earlier, well beyond any period of actual impairment. This gap between detectability and impairment is often central to disputing the criminal charge, though it generally does not change the license revocation outcome.

Q. What happens if I refuse the roadside drug test?

A. Refusing a lawfully requested test can lead to separate legal consequences and is typically viewed unfavorably in both the criminal case and the license proceeding. Whether the request itself was lawfully made and properly explained to you can be a separate point worth reviewing with counsel.

Q. Does a passenger's drug use affect the driver's case?

A. Generally no, unless there is evidence the driver also ingested the substance or was otherwise impaired while driving; the charge focuses on the driver's own condition and conduct (도로교통법 제45조). A passenger's drug use alone, without evidence connecting it to the driver, is not typically sufficient on its own.

Q. Can the license revocation be reduced instead of a full suspension period?

A. The available administrative remedies and any restriction period depend on the specific facts and prior record, and are decided through the objection or administrative appeal process rather than negotiation. Each case is evaluated on its own facts, so outcomes vary.

Q. Should I get a private drug test done separately?

A. An independent test taken well after the incident generally cannot substitute for or contradict the official confirmatory test taken at the time, since detection levels change over time. It may still be useful in some circumstances to help establish a broader picture of substance use timing, and this is worth discussing with counsel before pursuing it.

Official References

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